High-temperature superconducting (HTS) magnets have been investigated widely for their higher upper critical magnetic field, larger engineering critical current density and simpler cryogenic system compared with low-temperature superconducting magnets. However, in order to keep the permanent-current mode of the HTS magnets, the external power supply is usually employed to charge the magnet via copper current leads, which is a considerable heat source to the cooling system. Thus, in order to avoid the heat disturbance brought by the current leads, a new ‘through-wall’ dynamo-type HTS flux pump using a pair of magnetic couplers is proposed, realizing the truly wireless power transfer, and exploring its possible application for the conduction cooled system. Based on the proposed structure, the heat conduction, which was calculated to be about 7.75 W, and heat convection could be minimized. In addition, to further improve the charging performance of the dynamo-type flux pump, a ferromagnetic (FM) slice was added at different positions of the system. The effect of the FM slice on charging performance is studied numerically and experimentally. According to the results of simulations and experiments, adding an FM slice under the HTS stator improves the saturated current and the charging speed of the dynamo-type flux pump by 20%–30%.

中文翻译：

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铁磁片对采用磁耦合器的穿墙高温超导磁通泵充电性能的影响

与低温超导磁体相比，高温超导 (HTS) 磁体具有更高的上临界磁场、更大的工程临界电流密度和更简单的低温系统，因此受到广泛研究。然而，为了保持高温超导磁体的恒流模式，通常采用外部电源通过铜电流引线为磁体充电，这对冷却系统来说是一个相当大的热源。因此，为了避免电流引线带来的热干扰，提出了一种使用一对磁耦合器的新型“穿墙”发电机式高温超导磁通泵，实现了真正的无线电能传输，并探索了其在能源领域的可能应用。传导冷却系统。基于所提出的结构，计算出的热传导约为 7.75 W，并且热对流可以被最小化。此外，为了进一步提高发电机式磁通泵的充电性能，在系统的不同位置添加了铁磁（FM）片。通过数值和实验研究了 FM 切片对充电性能的影响。根据仿真和实验结果，在高温超导定子下增加一个调频片可使发电机式磁通泵的饱和电流和充电速度提高20%~30%。